It is said that creative people make bad businessmen.
Probably because, when it comes to creativity, one uses the left side of the brain (signifying creativity, passion, and impulse). On the other hand, to be a cutthroat, successful business owner one has to utilise facets such as logic, analysis and rationale, all of which are associated with the right brain. And the twain shall never go together.
Or, so it is said.